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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Change in Benefit Obligation [Roll Forward]      
Beginning of year balance $ 345.5 $ 331.9  
Service cost 2.6 4.9 $ 4.3
Interest cost 11.1 12.5 13.1
Actuarial (gain)/loss (24.5) 10.8  
Curtailment (1.3) 0.0  
Foreign exchange rate changes (4.5) 3.6  
Benefits Paid 32.2 18.2  
End of year balance 296.7 345.5 331.9
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance 265.9 239.9  
Actual return on plan assets (7.3) 27.8  
Employer contribution 52.9 12.7  
Foreign exchange rate changes (4.5) 3.7  
Fair value of plan assets, end of year balance 274.8 265.9 239.9
Funded status (21.9) (79.6)  
Amounts Recognized in Balance Sheet [Abstract]      
Noncurrent pension assets, included in “Other assets” 4.5 1.4  
Current pension liabilities, included in “Accounts payable and accrued liabilities” (3.1) (12.1)  
Noncurrent pension liabilities, included in “Other long-term liabilities” (23.3) (68.9)  
Amounts recognized in other comprehensive income—pre-tax      
Other Comprehensive Income (Loss), before Reclassifications, before Tax (12.4) 10.2 2.9
Reclassification from accumulated other comprehensive income, current period, before tax 8.1 9.7 6.0
Defined Benefit Plan, Accumulated Benefit Obligation 296.5 343.2  
Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]      
Accumulated benefit obligations 248.8 287.9  
Fair value of plan assets 222.4 207.7  
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation 248.8 288.7  
Plans with Projected Benefit Obligations in Excess of Plan Assets [Abstract]      
Fair value of plan assets 222.4 207.7  
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]      
Net actuarial loss (4.7)    
Prior service cost 0.5    
Total 5.2    
Benefits Expected to be Paid from Benefit Plans [Abstract]      
2019 22.4    
2020 20.3    
2021 20.4    
2022 19.6    
2023 20.1    
2024 - 2028 96.6    
Defined Benefit Plan, Plan Assets, Benefits Paid 32.2 18.2  
Multi-strategy Funds      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance [1] 82.5    
Fair value of plan assets, end of year balance 35.0 82.5 [1]  
Domestic stock funds      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance [2] 56.2    
Fair value of plan assets, end of year balance [2] 22.3 56.2  
International stock funds      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance [2] 43.1    
Fair value of plan assets, end of year balance [2] 13.2 43.1  
Domestic bond funds      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance [2] 40.2    
Fair value of plan assets, end of year balance 27.1 [3] 40.2 [2]  
Significant Unobservable Inputs (Level 3)      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance 12.9    
Fair value of plan assets, end of year balance 12.7 12.9  
Significant Unobservable Inputs (Level 3) | Multi-strategy Funds      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance [1] 12.9    
Fair value of plan assets, end of year balance 0.0 12.9 [1]  
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 147.5    
Fair value of plan assets, end of year balance 101.5 147.5  
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] 69.6    
Fair value of plan assets, end of year balance 35.0 69.6 [1]  
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] 42.2    
Fair value of plan assets, end of year balance [2] 22.3 42.2  
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] 15.5    
Fair value of plan assets, end of year balance [2] 13.2 15.5  
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] 20.2    
Fair value of plan assets, end of year balance [2] 27.1 20.2  
Fair Value, Inputs, Level 2      
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance 105.5    
Fair value of plan assets, end of year balance 160.6 105.5  
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 0.0 0.0 [1]  
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] 14.0    
Fair value of plan assets, end of year balance [2] 0.0 14.0  
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] 27.6    
Fair value of plan assets, end of year balance [2] 0.0 27.6  
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] 20.0    
Fair value of plan assets, end of year balance [2] 0.0 20.0  
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]      
Amounts recognized in other comprehensive income—pre-tax      
Other Comprehensive Income (Loss), before Reclassifications, before Tax 0.0 0.0 0.0
Reclassification from accumulated other comprehensive income, current period, before tax 0.5 0.5 0.5
Total (7.4) (7.9) (8.4)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Amounts recognized in other comprehensive income—pre-tax      
Other Comprehensive Income (Loss), before Reclassifications, before Tax 4.1 3.2  
Reclassification from accumulated other comprehensive income, current period, before tax 8.1 9.8  
Total (123.8) (136.0) (149.0)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]      
Amounts recognized in other comprehensive income—pre-tax      
Other Comprehensive Income (Loss), before Reclassifications, before Tax 4.1 3.2 (5.3)
Reclassification from accumulated other comprehensive income, current period, before tax 7.6 9.3 5.5
Total (116.4) (128.1) $ (140.6)
Defined Benefit, US Plans [Member]      
Change in Benefit Obligation [Roll Forward]      
Beginning of year balance 272.6    
End of year balance 244.8 272.6  
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance 207.7    
Employer contribution 33.2    
Fair value of plan assets, end of year balance 222.4 207.7  
Funded status $ (22.4) $ (64.9)  
Weighted average assumptions for obligations as of measurement date [Abstract]      
Discount rate 4.20% 3.50%  
Defined Benefit, Canadian Plans [Member]      
Change in Benefit Obligation [Roll Forward]      
Beginning of year balance $ 58.1    
End of year balance 49.0 $ 58.1  
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance 58.2    
Fair value of plan assets, end of year balance 52.4 58.2  
Funded status $ 3.4 $ 0.1  
Weighted average assumptions for obligations as of measurement date [Abstract]      
Discount rate 3.80% 3.30%  
Rate of compensation increase 3.50% 3.50%  
Defined Benefit, SERP [Member]      
Change in Benefit Obligation [Roll Forward]      
Beginning of year balance $ 14.8    
End of year balance 2.9 $ 14.8  
Change in Assets (Fair Value) [Roll Forward]      
Fair value of plan assets, beginning of year balance 0.0    
Fair value of plan assets, end of year balance 0.0 0.0  
Funded status $ (2.9) $ (14.8)  
Weighted average assumptions for obligations as of measurement date [Abstract]      
Discount rate   2.90%  
Rate of compensation increase   3.00%  
[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.