Retirement Plans - Amount Recognized on Consolidated and Combined Balance Sheets (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit cost (included in accrued liabilities) $ (100.7) $ (75.4)
Pension and other postretirement benefits plan liabilities (56.4) 0.0
Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Prepaid pension cost (included in other noncurrent assets) 0.0 0.1
Accrued benefit cost (included in accrued liabilities) (2.2) (3.3)
Pension and other postretirement benefits plan liabilities (55.3) 0.0
Net liabilities recognized in the Consolidated and Combined Balance Sheets (57.5) $ (3.2)
Other Postretirement Benefit Plan    
Defined Benefit Plan Disclosure [Line Items]    
Prepaid pension cost (included in other noncurrent assets) 0.0  
Accrued benefit cost (included in accrued liabilities) (0.1)  
Pension and other postretirement benefits plan liabilities (1.1)  
Net liabilities recognized in the Consolidated and Combined Balance Sheets $ (1.2)