Debt (Details) - Long-term debt - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015 |
Debt Instrument [Line Items] | | |
Total long-term debt | $ 5,494.5 | $ 5,465.5 |
Convertible senior notes | | |
Debt Instrument [Line Items] | | |
Total long-term debt | 49.5 | 52.3 |
Capital leases for equipment | | |
Debt Instrument [Line Items] | | |
Total long-term debt | 63.3 | 39.2 |
Senior Notes due 2023 | | |
Debt Instrument [Line Items] | | |
Total long-term debt | 535 | |
Senior Notes due 2022 | | |
Debt Instrument [Line Items] | | |
Total long-term debt | 1,600 | 1,600 |
Senior Notes due 2021 | | |
Debt Instrument [Line Items] | | |
Total long-term debt | 558.1 | 544.5 |
Senior Notes due 2019 | | |
Debt Instrument [Line Items] | | |
Total long-term debt | | 900 |
Senior Notes due 2018 | | |
Debt Instrument [Line Items] | | |
Total long-term debt | 265.8 | 265.8 |
Term loan facility | | |
Debt Instrument [Line Items] | | |
Total long-term debt | 2,016.5 | 1,584.1 |
Senior Debentures due 2034 | | |
Debt Instrument [Line Items] | | |
Total long-term debt | 300 | 300 |
Euro private placement notes due 2020 | | |
Debt Instrument [Line Items] | | |
Total long-term debt | 13.4 | 13.1 |
Asset financing | | |
Debt Instrument [Line Items] | | |
Total long-term debt | 92.9 | 166.5 |
Carrying Value | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 5,297.3 | 5,272.6 |
Carrying Value | Convertible senior notes | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 46.4 | 46.8 |
Carrying Value | Capital leases for equipment | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 63.3 | 39.2 |
Carrying Value | Senior Notes due 2023 | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 526.8 | |
Carrying Value | Senior Notes due 2022 | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 1,579.2 | 1,577 |
Carrying Value | Senior Notes due 2021 | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 551.1 | 536.6 |
Carrying Value | Senior Notes due 2019 | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | | 900.4 |
Carrying Value | Senior Notes due 2018 | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 267.4 | 268.2 |
Carrying Value | Term loan facility | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 1,955.2 | 1,524.4 |
Carrying Value | Senior Debentures due 2034 | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 200.4 | 199 |
Carrying Value | Euro private placement notes due 2020 | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 14.6 | 14.5 |
Carrying Value | Asset financing | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 92.9 | 166.5 |
Level 1 | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 3,522.8 | 2,655.7 |
Level 1 | Convertible senior notes | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 110.3 | 89.1 |
Level 1 | Capital leases for equipment | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 0 | 0 |
Level 1 | Senior Notes due 2023 | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 551.1 | |
Level 1 | Senior Notes due 2022 | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 1,674 | 1,479.8 |
Level 1 | Senior Notes due 2021 | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 586 | 0 |
Level 1 | Senior Notes due 2019 | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | | 920.3 |
Level 1 | Senior Notes due 2018 | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 272.2 | 0 |
Level 1 | Term loan facility | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 0 | 0 |
Level 1 | Senior Debentures due 2034 | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 236.3 | 0 |
Level 1 | Euro private placement notes due 2020 | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 0 | 0 |
Level 1 | Asset financing | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 92.9 | 166.5 |
Level 2 | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 2,113.4 | 2,606.8 |
Level 2 | Convertible senior notes | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 0 | 0 |
Level 2 | Capital leases for equipment | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 63.3 | 39.2 |
Level 2 | Senior Notes due 2023 | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 0 | |
Level 2 | Senior Notes due 2022 | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 0 | 0 |
Level 2 | Senior Notes due 2021 | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 0 | 507.5 |
Level 2 | Senior Notes due 2019 | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | | 0 |
Level 2 | Senior Notes due 2018 | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 0 | 271 |
Level 2 | Term loan facility | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 2,035.4 | 1,574.2 |
Level 2 | Senior Debentures due 2034 | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 0 | 201 |
Level 2 | Euro private placement notes due 2020 | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | 14.7 | 13.9 |
Level 2 | Asset financing | | |
Debt Instrument [Line Items] | | |
Long-term debt, fair value | $ 0 | $ 0 |