Long-Term Debt and Capital Leases - Debt Agreements (Details) - USD ($) $ in Millions | Jul. 17, 2017 | May 31, 2017 | Mar. 20, 2017 | Aug. 19, 2016 | May 11, 2016 | Mar. 31, 2017 | Mar. 31, 2018 |
Long-Term Debt and Capital Leases | | | | | | | |
Loss on early extinguishment of debt | | | | | | $ 5 | |
Term B Loans | Eighth Amendment to Senior Secured Credit Facilities | | | | | | | |
Long-Term Debt and Capital Leases | | | | | | | |
Face amount | $ 230.5 | | | | | | |
Outstanding balance | $ 2,280 | | | | | | |
Term B Loans | Eighth Amendment to Senior Secured Credit Facilities | Alternate base rate | | | | | | | |
Long-Term Debt and Capital Leases | | | | | | | |
Basis spread on variable rate (as a percent) | 2.25% | | | | | | |
Term B Loans | Eighth Amendment to Senior Secured Credit Facilities | LIBOR rate | | | | | | | |
Long-Term Debt and Capital Leases | | | | | | | |
Basis spread on variable rate (as a percent) | 3.25% | | | | | | |
Term B Loans | Sixth Amendment to Senior Secured Credit Facilities | | | | | | | |
Long-Term Debt and Capital Leases | | | | | | | |
Face amount | | | | $ 2,065 | | | |
Term of debt instrument | | | | 7 years | | | |
Term B Loans | Sixth Amendment to Senior Secured Credit Facilities | Debt refinancing existing Senior Notes | | | | | | | |
Long-Term Debt and Capital Leases | | | | | | | |
Period after August 19, 2023 prior to which maturity of indebtedness incurred to refinance debt triggers maturity of current debt | | | | 91 days | | | |
Term B Loans | Sixth Amendment to Senior Secured Credit Facilities | Debt refinancing existing Subordinated Notes | | | | | | | |
Long-Term Debt and Capital Leases | | | | | | | |
Period after August 19, 2023 prior to which maturity of indebtedness incurred to refinance debt triggers maturity of current debt | | | | 91 days | | | |
Term B Loans | Sixth Amendment to Senior Secured Credit Facilities | Alternate base rate | | | | | | | |
Long-Term Debt and Capital Leases | | | | | | | |
Basis spread on variable rate (as a percent) | | | | 2.50% | | | |
Term B Loans | Sixth Amendment to Senior Secured Credit Facilities | LIBOR rate | | | | | | | |
Long-Term Debt and Capital Leases | | | | | | | |
Basis spread on variable rate (as a percent) | | | | 3.50% | | | |
Variable interest rate floor (as a percent) | | | | 1.00% | | | |
Term B Loans | Fifth Amendment to Senior Secured Credit Facilities | | | | | | | |
Long-Term Debt and Capital Leases | | | | | | | |
Face amount | | | | | $ 432.5 | | |
Term B Loans | Fifth Amendment to Senior Secured Credit Facilities | Alternate base rate | | | | | | | |
Long-Term Debt and Capital Leases | | | | | | | |
Basis spread on variable rate (as a percent) | | | | | 2.50% | | |
Term B Loans | Fifth Amendment to Senior Secured Credit Facilities | LIBOR rate | | | | | | | |
Long-Term Debt and Capital Leases | | | | | | | |
Basis spread on variable rate (as a percent) | | | | | 3.50% | | |
Variable interest rate floor (as a percent) | | | | | 1.00% | | |
Term B-1 Loans | | | | | | | |
Long-Term Debt and Capital Leases | | | | | | | |
Repayments of long-term debt | | | | | $ 382.5 | | |
Term B-1 Loans | Alternate base rate | | | | | | | |
Long-Term Debt and Capital Leases | | | | | | | |
Basis spread on variable rate (as a percent) | | | | | 2.00% | | |
Term B-1 Loans | LIBOR rate | | | | | | | |
Long-Term Debt and Capital Leases | | | | | | | |
Basis spread on variable rate (as a percent) | | | | | 3.00% | | |
Variable interest rate floor (as a percent) | | | | | 0.75% | | |
Revolving Credit Facility | | | | | | | |
Long-Term Debt and Capital Leases | | | | | | | |
Borrowings available | | | | | | | $ 300 |
Revolving Credit Facility | Eighth Amendment to Senior Secured Credit Facilities | | | | | | | |
Long-Term Debt and Capital Leases | | | | | | | |
Additional borrowing capacity | $ 100 | | | | | | |
Borrowings available | 300 | | | | | | |
Proceeds from credit facility used to pay senior note | $ 180 | | | | | | |
Revolving Credit Facility | Eighth Amendment to Senior Secured Credit Facilities | Alternate base rate | | | | | | | |
Long-Term Debt and Capital Leases | | | | | | | |
Basis spread on variable rate (as a percent) | 2.00% | | | | | | |
Revolving Credit Facility | Eighth Amendment to Senior Secured Credit Facilities | LIBOR rate | | | | | | | |
Long-Term Debt and Capital Leases | | | | | | | |
Basis spread on variable rate (as a percent) | 3.00% | | | | | | |
Revolving Credit Facility | Seventh Amendment To Senior Secured Credit Facilities | | | | | | | |
Long-Term Debt and Capital Leases | | | | | | | |
Borrowings available | | $ 200 | | | | | |
Borrowing capacity upon compliance with conditions | | $ 300 | | | | | |
Revolving Credit Facility | Seventh Amendment To Senior Secured Credit Facilities | Alternate base rate | | | | | | | |
Long-Term Debt and Capital Leases | | | | | | | |
Basis spread on variable rate (as a percent) | | 2.00% | | | | | |
Revolving Credit Facility | Seventh Amendment To Senior Secured Credit Facilities | LIBOR rate | | | | | | | |
Long-Term Debt and Capital Leases | | | | | | | |
Basis spread on variable rate (as a percent) | | 3.00% | | | | | |
Senior Notes | | | | | | | |
Long-Term Debt and Capital Leases | | | | | | | |
Repayments of long-term debt | $ 729.9 | | $ 95.1 | | | | |
Interest rate (as a percent) | | | 10.25% | | | | |
Loss on early extinguishment of debt | | | $ 5 | | | | |
Prepayment penalties | 18.7 | | | | | | |
Payment of call premium | | | 4.9 | | | | |
Accrued interest paid | $ 37.6 | | $ 1.7 | | | | |