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- Net Periodic Expense (Income) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jul. 14, 2015
Dec. 31, 2017
Dec. 31, 2016
Jul. 02, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan, Net Periodic Benefit Cost              
Recognized pre-tax actuarial losses   $ 4.2 $ 10.2 $ 1.8   $ 1.8 $ 11.4
Amount of curtailment gain $ 5.1           5.1
Postretirement Plans              
Defined Benefit Plan, Net Periodic Benefit Cost              
Service cost         $ 0.0 0.0 0.1
Interest cost         3.5 4.2 4.4
Amortization of unrecognized prior service credits         (1.7) (0.8) (0.8)
Settlements         (2.6) 0.0 (1.8)
Recognized net actuarial (gains) losses         (2.8) 0.6 (4.0)
Total net periodic pension benefit expense         $ (3.6) $ 4.0 $ (2.1)
Weighted-average actuarial assumptions used in determining net periodic pension expense:              
Discount rate (as a percent)         3.60% 3.88% 3.53%
Weighted-average actuarial assumptions used in determining year-end benefit obligations:              
Discount rate (as a percent)   3.34% 3.69%   3.34% 3.69% 3.88%
Assumed health care cost trend rates:              
Heath care cost trend rate for next year (as a percent)   7.25% 7.50%   7.25% 7.50% 6.60%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) (as a percent)   5.00% 5.00%   5.00% 5.00% 5.00%
Year that the rate reaches the ultimate trend rate         2027 2027 2024
Effects on postretirement expense of a percentage point change in assumed health care cost trend rates              
Effect of 1% increase on total of service and interest costs         $ 1.4    
Effect of 1% decrease on total of service and interest costs         1.6    
United States              
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets              
Projected benefit obligation   $ 357.1 $ 348.1   357.1 $ 348.1  
Accumulated benefit obligation   357.1 347.9   357.1 347.9  
Fair value of plan assets   269.7 261.9   269.7 261.9  
Accumulated benefit obligation   $ 357.1 $ 347.9   357.1 347.9  
Defined Benefit Plan, Net Periodic Benefit Cost              
Service cost         0.3 0.4 $ 2.5
Interest cost         13.4 13.9 16.5
Expected return on plan assets         (10.1) (12.9) (18.0)
Amortization of unrecognized prior service credits         (0.1) (0.2) (0.1)
Recognized net actuarial (gains) losses         3.9 3.2 18.9
Total net periodic pension benefit expense         $ 7.4 $ 4.4 $ 19.8
Weighted-average actuarial assumptions used in determining net periodic pension expense:              
Discount rate (as a percent)         3.98% 4.06% 4.09%
Rate of increase in compensation levels (as a percent)         3.75% 3.75% 3.75%
Expected long-term rate of return on assets (as a percent)         4.00% 5.00% 5.75%
Weighted-average actuarial assumptions used in determining year-end benefit obligations:              
Discount rate (as a percent)   3.57% 3.98%   3.57% 3.98% 4.24%
Rate of increase in compensation levels (as a percent)   3.75% 3.75%   3.75% 3.75% 3.75%
Foreign Plan              
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets              
Projected benefit obligation   $ 0.2 $ 43.8   $ 0.2 $ 43.8  
Accumulated benefit obligation   0.2 43.8   0.2 43.8  
Fair value of plan assets   0.0 43.2   0.0 43.2  
Accumulated benefit obligation   $ 175.2 $ 157.6   175.2 157.6  
Defined Benefit Plan, Net Periodic Benefit Cost              
Service cost         0.0 0.0 $ 1.3
Interest cost         4.9 5.6 7.7
Expected return on plan assets         (6.4) (6.6) (9.7)
Recognized net actuarial (gains) losses         3.1 8.2 3.8
Total net periodic pension benefit expense         1.6 7.2 3.1
Less: Net periodic pension expense of discontinued operations         0.0 (0.2) (2.2)
Net periodic pension benefit expense of continuing operations         $ 1.6 $ 7.0 $ 0.9
Weighted-average actuarial assumptions used in determining net periodic pension expense:              
Discount rate (as a percent)         2.97% 3.82% 3.68%
Rate of increase in compensation levels (as a percent)             4.00%
Expected long-term rate of return on assets (as a percent)         4.09% 4.57% 5.81%
Weighted-average actuarial assumptions used in determining year-end benefit obligations:              
Discount rate (as a percent)   2.76% 2.97%   2.76% 2.97% 3.82%
Rate of increase in compensation levels (as a percent)             4.00%