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Summary of Significant Accounting Policies - Changes in the Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Pre-tax $ (31.3) $ 52.0 $ 9.7
Tax (3.8) (2.1) (7.6)
Net of Tax 30.2 (49.9) (2.1)
Net of Tax (35.1)    
Pension and OPEB liability adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Pre-tax (0.9) 15.4 3.4
Tax (2.4) (3.8) (4.3)
Net of Tax 3.3 (11.6) 0.9
Derivative instrument adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Pre-tax (2.4)    
Tax 1.4    
Net of Tax 1.0    
Derivative instrument adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Pre-tax   5.1 23.0
Tax   (2.8) (3.3)
Net of Tax   (2.3) (19.7)
Unrealized foreign currency translation adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Pre-tax (28.0) 31.5 (16.7)
Tax (2.8) 4.5 0.0
Net of Tax 30.8 $ (36.0) $ 16.7
Accounting Standards Update 2018-02 [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets $ 4.9