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Accumulated Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax $ (4.5) $ (0.3) $ 3.9  
Accumulated comprehensive loss, net of tax, beginning of period (122.1) (137.2) (146.1) $ (131.3)
Other Comprehensive Income (Loss), before Reclassifications, before Tax 10.2 2.9 (9.6)  
Other Comprehensive Income (Loss) before Reclassifications, Tax 1.4 (2.2) 0.7  
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 8.8 5.1 (10.3)  
Reclassification from accumulated other comprehensive income, current period, before tax 9.7 6.0 (7.3)  
Reclassification from AOCI, Current Period, Tax (3.4) (2.2) 2.8  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 6.3 3.8 (4.5)  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 15.1 8.9 (14.8)  
Accumulated comprehensive loss, net of tax, end of period (122.1) (137.2) (146.1) (131.3)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated comprehensive loss, net of tax, beginning of period (39.7) (46.3) (55.1) (33.7)
Other Comprehensive Income (Loss), before Reclassifications, before Tax 6.6 8.8 (21.4)  
Other Comprehensive Income (Loss) before Reclassifications, Tax 0.0 0.0 0.0  
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 6.6 8.8 (21.4)  
Reclassification from accumulated other comprehensive income, current period, before tax 0.0 0.0 0.0  
Reclassification from AOCI, Current Period, Tax 0.0 0.0  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0.0 0.0 0.0  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 6.6 8.8 (21.4)  
Accumulated comprehensive loss, net of tax, end of period (39.7) (46.3) (55.1) (33.7)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated comprehensive loss, net of tax, beginning of period (79.5) (87.7) (87.8) (93.1)
Other Comprehensive Income (Loss), before Reclassifications, before Tax 3.2 (5.3) 9.5  
Other Comprehensive Income (Loss) before Reclassifications, Tax 1.1 (1.9) 0.0  
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 2.1 (3.4) 9.5  
Reclassification from accumulated other comprehensive income, current period, before tax 9.3 5.5 (6.8)  
Reclassification from AOCI, Current Period, Tax (3.2) (2.0) 2.6  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 6.1 3.5 (4.2)  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 8.2 0.1 5.3  
Accumulated comprehensive loss, net of tax, end of period (79.5) (87.7) (87.8) (93.1)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated comprehensive loss, net of tax, beginning of period (4.9) (5.2) (5.5) (5.9)
Other Comprehensive Income (Loss), before Reclassifications, before Tax 0.0 0.0 0.7  
Other Comprehensive Income (Loss) before Reclassifications, Tax 0.0 0.0 0.0  
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0.0 0.0 0.7  
Reclassification from accumulated other comprehensive income, current period, before tax 0.5 0.5 (0.5)  
Reclassification from AOCI, Current Period, Tax (0.2) (0.2) 0.2  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0.3 0.3 (0.3)  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 0.3 0.3 0.4  
Accumulated comprehensive loss, net of tax, end of period (4.9) (5.2) (5.5) (5.9)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated comprehensive loss, net of tax, beginning of period 3.5 2.7 3.3 2.6
Other Comprehensive Income (Loss), before Reclassifications, before Tax 1.3 (1.0) 1.4  
Other Comprehensive Income (Loss) before Reclassifications, Tax 0.5 (0.4) 0.7  
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0.8 (0.6) 0.7  
Reclassification from accumulated other comprehensive income, current period, before tax 0.0 0.0 0.0  
Reclassification from AOCI, Current Period, Tax 0.0 0.0 0.0  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0.0 0.0 0.0  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 0.8 (0.6) 0.7  
Accumulated comprehensive loss, net of tax, end of period 3.5 2.7 3.3 2.6
Accumulated Other Post Retirement Benefits Adjustment, Net [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated comprehensive loss, net of tax, beginning of period (1.5) (0.7) (1.0) (1.2)
Other Comprehensive Income (Loss), before Reclassifications, before Tax (0.9) 0.4 0.2  
Other Comprehensive Income (Loss) before Reclassifications, Tax (0.2) 0.1 0.0  
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (0.7) 0.3 0.2  
Reclassification from accumulated other comprehensive income, current period, before tax (0.1) 0.0 0.0  
Reclassification from AOCI, Current Period, Tax 0.0 0.0 0.0  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (0.1) 0.0 0.0  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (0.8) 0.3 0.2  
Accumulated comprehensive loss, net of tax, end of period $ (1.5) $ (0.7) $ (1.0) $ (1.2)