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Stockholders' Equity - Changes in Accumulated Other Comprehensive Income by Component (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2017
USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]  
Balance at January 1, 2017 $ (139.6)
Amounts reclassified from AOCI, net of tax 8.6
Balance at September 30, 2017 (131.0)
Unfunded Employee Benefit Obligations  
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]  
Balance at January 1, 2017 (121.4)
Amounts reclassified from AOCI, net of tax 6.2
Balance at September 30, 2017 (115.2)
Treasury Lock | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges  
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]  
Balance at January 1, 2017 (17.8)
Amounts reclassified from AOCI, net of tax 2.6
Balance at September 30, 2017 (15.2)
Foreign Exchange Contract | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges  
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]  
Balance at January 1, 2017 (0.4)
Amounts reclassified from AOCI, net of tax (0.2)
Balance at September 30, 2017 $ (0.6)