Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details)

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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Oct. 01, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]              
Stockholders' equity $ 1,150.3 $ 1,277.8 $ 1,232.2 $ 1,252.4 $ 1,235.7 $ 1,079.4  
Retained Earnings              
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]              
Stockholders' equity 770.5 737.1 666.2 627.1 603.1 481.4  
Retained Earnings | Accounting Standards Update 2018-02 [Member] | Cumulative Effect, Period of Adoption, Adjustment              
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]              
Stockholders' equity             $ 6.0
Accumulated Other Comprehensive Loss              
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]              
Stockholders' equity $ (101.2) $ (47.7) $ (46.3) $ (55.2) $ (85.8) $ (102.8)