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Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($)
$ in Millions
 3 Months Ended
Oct. 01, 2018
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of period   $ 2,599.8  
Total other comprehensive income (loss), net of tax   19.7 $ (8.8)
Balance at end of period   2,681.1  
Employee Pension and Postretirement Benefits, Net of Tax      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of period $ (10.9) (69.4) (10.9)
Amounts reclassified from accumulated other comprehensive income (loss)   0.7  
Total other comprehensive income (loss), net of tax   0.7  
Balance at end of period (20.0) (68.7) (20.0)
Employee Pension and Postretirement Benefits, Net of Tax | Accounting Standards Update 2018-02      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification (9.1)    
Cumulative Translation Adjustments      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of period (96.2) (132.5) (96.2)
Other comprehensive income (loss) before reclassifications   19.5 (8.8)
Total other comprehensive income (loss), net of tax   19.5 (8.8)
Balance at end of period (96.2) (113.0) (105.0)
Derivative Instruments      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of period 0.3 0.3 0.3
Other comprehensive income (loss) before reclassifications   (0.5)  
Total other comprehensive income (loss), net of tax   (0.5)  
Balance at end of period 0.3 (0.2) 0.3
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of period (106.8) (201.6) (106.8)
Other comprehensive income (loss) before reclassifications   19.0 (8.8)
Amounts reclassified from accumulated other comprehensive income (loss)   0.7  
Total other comprehensive income (loss), net of tax   19.7 (8.8)
Balance at end of period (115.9) $ (181.9) $ (124.7)
Accumulated Other Comprehensive Income (Loss) | Accounting Standards Update 2018-02      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification $ (9.1)