Condensed Consolidated Statements of Stockholders' Equity Statement - USD ($) $ in Millions | Total | Preferred Stock | Common Stock | Additional Paid-in Capital | Accumulated Deficit | Net investment of Post | Hedging Adjustments, net of tax | Foreign Currency Translation Adjustments |
Stockholders' Equity, beginning of period at Sep. 30, 2018 | | $ 0 | $ 0 | $ 0 | | $ 453.1 | $ 0 | $ (1.4) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | | | |
Net change in hedges, net of tax | | | | | | | 0 | |
Foreign currency translation adjustments | | | | | | | | (0.7) |
Impact of initial public offering | | | | | $ 0 | 0 | | |
Distribution declared to Post Holdings, Inc. | | | | | 0 | | | |
Reclassification of net investment of Post Holdings, Inc. | | | | | 0 | 0 | | |
Redemption value adjustment to noncontrolling interest | | | | 0 | 0 | | | |
Stock Issued During Period, Value, New Issues | | | 0 | | 0 | | | |
Stock-based compensation expense | | | | 0 | | | | |
Net earnings available to Class A common stockholders | $ 0 | | | | 0 | | | |
Net earnings attributable to redeemable noncontrolling interest | 56.1 | | | | | 56.1 | | |
Net (decrease) increase in net investment of Post Holdings, Inc. | | | | | | (2.5) | | |
Stockholders' Equity, end of period at Mar. 31, 2019 | 504.6 | 0 | 0 | 0 | 0 | 506.7 | 0 | (2.1) |
Stockholders' Equity, beginning of period at Dec. 31, 2018 | | | 0 | 0 | 0 | 474.2 | 0 | (1.7) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | | | |
Net change in hedges, net of tax | | | | | | | 0 | |
Foreign currency translation adjustments | | | | | | | | (0.4) |
Impact of initial public offering | | | | | 0 | 0 | | |
Distribution declared to Post Holdings, Inc. | | | | | 0 | | | |
Reclassification of net investment of Post Holdings, Inc. | | | | | 0 | 0 | | |
Redemption value adjustment to noncontrolling interest | | | | 0 | 0 | | | |
Stock Issued During Period, Value, New Issues | | | 0 | | | | | |
Stock-based compensation expense | | | | 0 | | | | |
Net earnings available to Class A common stockholders | 0 | | | | 0 | | | |
Net earnings attributable to redeemable noncontrolling interest | 31 | | | | | 31 | | |
Net (decrease) increase in net investment of Post Holdings, Inc. | | | | | | 1.5 | | |
Stockholders' Equity, end of period at Mar. 31, 2019 | 504.6 | 0 | 0 | 0 | 0 | 506.7 | 0 | (2.1) |
Stockholders' Equity, beginning of period at Sep. 30, 2019 | 486.4 | 0 | 0 | 0 | 0 | 489 | 0 | (2.6) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | | | |
Net change in hedges, net of tax | | | | | | | (2.3) | |
Foreign currency translation adjustments | | | | | | | | 0.4 |
Impact of initial public offering | | | | | (2,112.4) | 29.9 | | |
Distribution declared to Post Holdings, Inc. | | | | | (11.7) | | | |
Reclassification of net investment of Post Holdings, Inc. | | | | | 524.4 | (524.4) | | |
Redemption value adjustment to noncontrolling interest | | | | (1.1) | (269.2) | | | |
Stock Issued During Period, Value, New Issues | | | 0.4 | | (0.4) | | | |
Stock-based compensation expense | | | | 1.1 | | | | |
Net earnings available to Class A common stockholders | 10.2 | | | | 10.2 | | | |
Net earnings attributable to redeemable noncontrolling interest prior to IPO | 5.5 | | | | | 5.5 | | |
Net earnings attributable to redeemable noncontrolling interest | 40.2 | | | | | | | |
Net (decrease) increase in net investment of Post Holdings, Inc. | | | | | | 0 | | |
Stockholders' Equity, end of period at Mar. 31, 2020 | (1,863.2) | 0 | 0.4 | 0 | (1,859.1) | 0 | (2.3) | (2.2) |
Stockholders' Equity, beginning of period at Dec. 31, 2019 | | | 0.4 | 0.3 | (2,276.9) | 0 | 0.2 | (2.2) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | | | |
Net change in hedges, net of tax | | | | | | | (2.5) | |
Foreign currency translation adjustments | | | | | | | | 0 |
Impact of initial public offering | | | | | 4.7 | 0 | | |
Distribution declared to Post Holdings, Inc. | | | | | (11.7) | | | |
Reclassification of net investment of Post Holdings, Inc. | | | | | 0 | 0 | | |
Redemption value adjustment to noncontrolling interest | | | | (1.1) | 420.6 | | | |
Stock Issued During Period, Value, New Issues | | | 0 | | 0 | | | |
Stock-based compensation expense | | | | 0.8 | | | | |
Net earnings available to Class A common stockholders | 4.2 | | | | 4.2 | | | |
Net earnings attributable to redeemable noncontrolling interest prior to IPO | 0 | | | | | 0 | | |
Net earnings attributable to redeemable noncontrolling interest | 14.4 | | | | | | | |
Net (decrease) increase in net investment of Post Holdings, Inc. | | | | | | 0 | | |
Stockholders' Equity, end of period at Mar. 31, 2020 | $ (1,863.2) | $ 0 | $ 0.4 | $ 0 | $ (1,859.1) | $ 0 | $ (2.3) | $ (2.2) |