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Stockholders' Equity - Reclassifications from Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax benefit $ (4.8) $ (10.4) $ (10.5) $ (18.7)
Amount Reclassified from Accumulated Other Comprehensive Loss        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of actuarial losses of defined benefit pension plans (1.5) (2.0) (3.0) (3.8)
Income tax benefit 0.5 0.7 1.0 1.4
Total reclassifications for the period, net of tax (1.0) (1.3) (2.0) (2.4)
Other (income) expense, net | Amount Reclassified from Accumulated Other Comprehensive Loss        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of actuarial losses of defined benefit pension plans     0.1 0.0
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) | Amount Reclassified from Accumulated Other Comprehensive Loss        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of actuarial losses of defined benefit pension plans $ (1.5) $ (2.0) $ (3.1) $ (3.8)