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Retirement Plans and Other Primary Tables (Details)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
pensionplans
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Minimum Contribution Requirement $ 0.0 $ 0.0 $ 0.0
Number of common shares held in rabbi trust (in shares) | shares 0.8 0.9  
Amounts recognized in the statement of financial position consist of:      
Non-current liabilities $ 151.3 $ 153.8  
U.S. Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Number of qualified pension plans maintained by entity | pensionplans 1    
Basis of Serp Benefit Compensation Earned Years of Employment 5 years    
Accumulated benefit obligation at end of year $ 153.3 161.2  
Change in benefit obligation:      
Benefit obligation at beginning of year 167.6 174.0  
Service cost 0.6 0.6 1.1
Interest cost 6.4 7.1 7.2
Acquisitions and divestitures 0.0 0.0  
Settlements 0.0 0.0  
Actuarial loss (gain) 0.1 2.5  
Benefits paid (14.3) (16.6)  
Foreign Exchange effect 0.0 0.0  
Benefit obligation at end of year 160.4 167.6 174.0
Change in plan assets:      
Fair value of plan assets at beginning of year 117.1 123.1  
Actual return on plan assets 14.5 9.5  
Settlements 0.0 0.0  
Employer contribution 1.2 1.1  
Employee contribution 0.0 0.0 0.0
Benefits paid (14.3) (16.6)  
Foreign exchange effect 0.0 0.0  
Fair value of plan assets at end of year 118.5 117.1 $ 123.1
Funded status (41.9) (50.5)  
Amounts recognized in the statement of financial position consist of:      
Current liabilities 1.2 1.2  
Non-current liabilities 40.7 49.3  
Total liabilities 41.9 50.5  
Amounts recognized in accumulated other comprehensive income consist of:      
Actuarial net loss 64.8 75.6  
Prior service cost 0.1 0.3  
Total amounts recognized in accumulated other comprehensive income $ 64.9 $ 75.9  
Weighted-average assumptions as of December 31:      
Discount rate [1] 3.78% 4.03% 4.20%
Expected return on plan assets 7.00% 7.00% 7.50%
Rate of compensation increase [1] 3.75% 3.75% 3.75%
Components of net periodic cost:      
Service cost $ 0.6 $ 0.6 $ 1.1
Interest cost 6.4 7.1 7.2
Expected return on plan assets (7.8) (8.3) (9.9)
Recognition of prior service cost 0.1 0.2 0.1
Amortization of actuarial loss 4.1 4.2 3.8
Settlements 0.0 0.0 0.0
Other 0.0 0.0 0.0
Net periodic cost 3.4 3.8 2.3
Non-U.S. Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation at end of year 229.4 209.7  
Change in benefit obligation:      
Benefit obligation at beginning of year 211.5 217.1  
Service cost 3.2 3.1 2.9
Interest cost 5.0 6.5 6.9
Acquisitions and divestitures (0.1) (5.5)  
Settlements 5.0 0.0  
Actuarial loss (gain) 1.1 25.9  
Benefits paid (7.1) (9.4)  
Foreign Exchange effect 23.0 (26.2)  
Benefit obligation at end of year 231.6 211.5 217.1
Change in plan assets:      
Fair value of plan assets at beginning of year 108.3 111.2  
Actual return on plan assets 6.9 18.4  
Settlements 5.0 0.0  
Employer contribution 7.5 6.7  
Employee contribution 0.4 0.4 0.3
Benefits paid (7.1) (9.4)  
Foreign exchange effect 10.2 (19.0)  
Fair value of plan assets at end of year 121.2 108.3 $ 111.2
Funded status (110.4) (103.2)  
Amounts recognized in the statement of financial position consist of:      
Current liabilities 2.8 2.4  
Non-current liabilities 107.6 100.8  
Total liabilities 110.4 103.2  
Amounts recognized in accumulated other comprehensive income consist of:      
Actuarial net loss 68.2 148.5  
Prior service cost 0.1 (2.2)  
Total amounts recognized in accumulated other comprehensive income $ 68.3 $ 146.3  
Weighted-average assumptions as of December 31:      
Discount rate [1] 2.15% 2.27% 3.23%
Expected return on plan assets 4.43% 5.90% 5.93%
Rate of compensation increase [1] 0.93% 0.89% 0.83%
Components of net periodic cost:      
Service cost $ 3.2 $ 3.1 $ 2.9
Interest cost 5.0 6.5 6.9
Expected return on plan assets (5.0) (6.0) (7.0)
Recognition of prior service cost 0.0 0.0 0.0
Amortization of actuarial loss 3.5 2.5 3.2
Settlements 1.5 0.0 0.0
Other (0.4) (0.4) (0.3)
Net periodic cost 7.8 5.7 5.7
Savings Plan      
Defined Benefit Plan Disclosure [Line Items]      
Employee Benefits and Share-based Compensation 16.9 19.3 20.6
Other Benefits      
Change in benefit obligation:      
Benefit obligation at beginning of year 4.2 4.9  
Service cost 0.0 0.0 0.0
Interest cost 0.1 0.2 0.2
Acquisitions and divestitures 0.0 0.0  
Settlements 0.0 0.0  
Actuarial loss (gain) (0.4) (0.6)  
Benefits paid (0.5) (0.3)  
Foreign Exchange effect 0.0 0.0  
Benefit obligation at end of year 3.4 4.2 4.9
Change in plan assets:      
Fair value of plan assets at beginning of year 0.0 0.0  
Actual return on plan assets 0.0 0.0  
Settlements 0.0 0.0  
Employer contribution 0.5 0.3  
Employee contribution 0.0 0.0 0.0
Benefits paid (0.5) (0.3)  
Foreign exchange effect 0.0 0.0  
Fair value of plan assets at end of year 0.0 0.0 $ 0.0
Funded status (3.4) (4.2)  
Amounts recognized in the statement of financial position consist of:      
Current liabilities 0.4 0.5  
Non-current liabilities 3.0 3.7  
Total liabilities 3.4 4.2  
Amounts recognized in accumulated other comprehensive income consist of:      
Actuarial net loss 0.9 0.0  
Prior service cost 0.0 0.0  
Total amounts recognized in accumulated other comprehensive income $ 0.9 $ 0.0  
Weighted-average assumptions as of December 31:      
Discount rate [1] 3.58% 3.81% 3.91%
Components of net periodic cost:      
Service cost $ 0.0 $ 0.0 $ 0.0
Interest cost 0.1 0.2 0.2
Expected return on plan assets 0.0 0.0 0.0
Recognition of prior service cost 0.0 0.0 0.0
Amortization of actuarial loss (1.2) 0.0 0.1
Settlements 0.0 0.0 0.0
Other 0.0 0.0 0.0
Net periodic cost $ (1.1) $ 0.2 $ 0.3
[1] The weighted average assumptions as of December 31 are used to calculate the funded status at the end of the current year and the net periodic cost for the subsequent year.