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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Accumulated balances for each classification of comprehensive income (loss)        
Balance at the beginning of the period     $ 2,347.4 $ 2,205.0
Other comprehensive loss $ (0.3) $ (8.5) (4.6) (15.6)
Balance at the end of the period 2,446.9 2,364.1 2,446.9 2,364.1
Accrued post-retirement benefit liability        
Accumulated balances for each classification of comprehensive income (loss)        
Balance at the beginning of the period (26.6) (30.4) (27.4) (32.0)
Amounts reclassified from accumulated other comprehensive loss 0.6 1.3 1.8 3.9
Income tax benefit (expense) (0.3) (0.5) (0.7) (1.5)
Other comprehensive loss 0.3 0.8 1.1 2.4
Balance at the end of the period (26.3) (29.6) (26.3) (29.6)
Foreign currency translation        
Accumulated balances for each classification of comprehensive income (loss)        
Balance at the beginning of the period (64.8) (38.9) (60.0) (30.4)
Other comprehensive loss before reclassifications (0.5) (9.2) (5.3) (17.7)
Other comprehensive loss (0.5) (9.2) (5.3) (17.7)
Balance at the end of the period (65.3) (48.1) (65.3) (48.1)
Other        
Accumulated balances for each classification of comprehensive income (loss)        
Balance at the beginning of the period   0.4 0.3 0.6
Other comprehensive loss before reclassifications (0.1)   (0.3)  
Amounts reclassified from accumulated other comprehensive loss   (0.2) (0.2) (0.4)
Income tax benefit (expense)   0.1 0.1 0.1
Other comprehensive loss (0.1) (0.1) (0.4) (0.3)
Balance at the end of the period (0.1) 0.3 (0.1) 0.3
Accumulated Other Comprehensive Income (loss).        
Accumulated balances for each classification of comprehensive income (loss)        
Balance at the beginning of the period (91.4) (68.9) (87.1) (61.8)
Other comprehensive loss before reclassifications (0.6) (9.2) (5.6) (17.7)
Amounts reclassified from accumulated other comprehensive loss 0.6 1.1 1.6 3.5
Income tax benefit (expense) (0.3) (0.4) (0.6) (1.4)
Other comprehensive loss (0.3) (8.5) (4.6) (15.6)
Balance at the end of the period $ (91.7) $ (77.4) $ (91.7) $ (77.4)