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Retirement Plans and Post Retirement Benefits Funded Status, Assumptions Used in Benefit Obligations and Amounts Recognized in Balance Sheets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Change in Benefit Obligation [Roll Forward]      
Beginning of year balance $ 331.9 $ 330.8  
Service cost 4.9 4.3 $ 3.8
Interest cost 12.5 13.1 13.1
Actuarial (gain)/loss 10.8 3.5  
Foreign exchange rate changes 3.6 1.6  
End of year balance 345.5 331.9 330.8
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance 239.9 237.4  
Actual return on plan assets 27.8 11.8  
Employer contribution 12.7 10.5  
Foreign exchange rate changes 3.7 1.6  
Fair value of plan assets, end of year balance 265.9 239.9 237.4
Funded status $ (79.6) $ (92.0)  
Weighted average assumptions for obligations as of measurement date [Abstract]      
Discount rate 3.40% 3.90%  
Rate of compensation increase 0.70% 0.70%  
Amounts Recognized in Balance Sheet [Abstract]      
Noncurrent pension assets, included in “Other assets” $ 1.4 $ 0.9  
Current pension liabilities, included in “Accounts payable and accrued liabilities” (12.1) (0.2)  
Noncurrent pension liabilities, included in “Other long-term liabilities” (68.9) (92.7)  
Total (79.6) (92.0)  
Amounts recognized in other comprehensive income—pre-tax      
Net actuarial loss 128.0 140.6  
Prior service cost 8.0 8.4  
Total 136.0 149.0  
Defined Benefit Plan, Accumulated Benefit Obligation 343.2 326.8  
Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]      
Accumulated benefit obligations 287.9 284.0  
Fair value of plan assets 207.7 194.2  
Plans with Projected Benefit Obligations in Excess of Plan Assets [Abstract]      
Projected benefit obligations 288.7 287.1  
Fair value of plan assets 207.7 194.2  
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]      
Net actuarial loss 6.1    
Prior service cost 0.5    
Total 6.6    
Benefits Expected to be Paid from Benefit Plans [Abstract]      
2017 31.4    
2018 19.7    
2019 20.9    
2020 20.6    
2021 25.5    
2022 - 2026 100.0    
Multi-strategy Funds      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance [1] 75.1    
Fair value of plan assets, end of year balance [1] 82.5 75.1  
Domestic stock funds      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance [2] 51.3    
Fair value of plan assets, end of year balance [2] 56.2 51.3  
International stock funds      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance [2] 38.5    
Fair value of plan assets, end of year balance [2] 43.1 38.5  
Domestic bond funds      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance [2] 36.8    
Fair value of plan assets, end of year balance 40.2 [3] 36.8 [2]  
Significant Unobservable Inputs (Level 3)      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance 12.2    
Fair value of plan assets, end of year balance 12.9 12.2  
Significant Unobservable Inputs (Level 3) | Multi-strategy Funds      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance 12.2 [1] 13.3  
Fair value of plan assets, end of year balance 12.9 [1] 12.2 [1] $ 13.3
Significant Unobservable Inputs (Level 3) | Domestic stock funds      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance [2] 0.0    
Fair value of plan assets, end of year balance [2] 0.0 0.0  
Significant Unobservable Inputs (Level 3) | International stock funds      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance [2] 0.0    
Fair value of plan assets, end of year balance [2] 0.0 0.0  
Significant Unobservable Inputs (Level 3) | Domestic bond funds      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance [2] 0.0    
Fair value of plan assets, end of year balance [2] 0.0 0.0  
Fair Value, Inputs, Level 1 [Member]      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance 151.2    
Fair value of plan assets, end of year balance 147.5 151.2  
Fair Value, Inputs, Level 1 [Member] | Multi-strategy Funds      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance [1] 62.9    
Fair value of plan assets, end of year balance [1] 69.6 62.9  
Fair Value, Inputs, Level 1 [Member] | Domestic stock funds      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance [2] 38.0    
Fair value of plan assets, end of year balance [2] 42.2 38.0  
Fair Value, Inputs, Level 1 [Member] | International stock funds      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance [2] 13.5    
Fair value of plan assets, end of year balance [2] 15.5 13.5  
Fair Value, Inputs, Level 1 [Member] | Domestic bond funds      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance [2] 36.8    
Fair value of plan assets, end of year balance [2] 20.2 36.8  
Fair Value, Inputs, Level 2      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance 76.5    
Fair value of plan assets, end of year balance 105.5 76.5  
Fair Value, Inputs, Level 2 | Multi-strategy Funds      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance [1] 0.0    
Fair value of plan assets, end of year balance [1] 0.0 0.0  
Fair Value, Inputs, Level 2 | Domestic stock funds      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance [2] 13.3    
Fair value of plan assets, end of year balance [2] 14.0 13.3  
Fair Value, Inputs, Level 2 | International stock funds      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance [2] 25.0    
Fair value of plan assets, end of year balance [2] 27.6 25.0  
Fair Value, Inputs, Level 2 | Domestic bond funds      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance [2] 0.0    
Fair value of plan assets, end of year balance [2] $ 20.0 $ 0.0  
[1] The multi-strategy funds invest in various hedge funds that employ a fund of funds strategy.
[2] Equity investments include investments in funds that are primarily invested in large capitalization U.S. and international equity securities and a mutual fund.
[3] Fixed income investments include investments in funds that are primarily invested in a diversified portfolio of investment grade U.S. and international debt securities.