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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Accumulated balances for each classification of comprehensive income (loss)          
Balance at the beginning of the period     $ 2,347.4 $ 2,205.0 $ 2,205.0
Other comprehensive income (loss) $ (14.7) $ 12.9 (4.3) (7.1) (25.3)
Balance at the end of the period 2,490.1   2,490.1   2,347.4
Accrued post-retirement benefit liability          
Accumulated balances for each classification of comprehensive income (loss)          
Balance at the beginning of the period (27.0) (31.2) (27.4) (32.0) (32.0)
Amounts reclassified from accumulated other comprehensive loss 0.6 1.3 1.2 2.6  
Income tax benefit (expense) (0.2) (0.5) (0.4) (1.0)  
Other comprehensive income (loss) 0.4 0.8 0.8 1.6  
Balance at the end of the period (26.6) (30.4) (26.6) (30.4) (27.4)
Foreign currency translation          
Accumulated balances for each classification of comprehensive income (loss)          
Balance at the beginning of the period (49.8) (51.1) (60.0) (30.4) (30.4)
Other comprehensive income (loss) before reclassifications (15.0) 12.2 (4.8) (8.5)  
Other comprehensive income (loss) (15.0) 12.2 (4.8) (8.5)  
Balance at the end of the period (64.8) (38.9) (64.8) (38.9) (60.0)
Other          
Accumulated balances for each classification of comprehensive income (loss)          
Balance at the beginning of the period 0.1 0.5 0.3 0.6 0.6
Amounts reclassified from accumulated other comprehensive loss (0.1) (0.1) (0.4) (0.3)  
Income tax benefit (expense)     0.1 0.1  
Other comprehensive income (loss) (0.1) (0.1) (0.3) (0.2)  
Balance at the end of the period   0.4   0.4 0.3
Accumulated Other Comprehensive Income (loss).          
Accumulated balances for each classification of comprehensive income (loss)          
Balance at the beginning of the period (76.7) (81.8) (87.1) (61.8) (61.8)
Other comprehensive income (loss) before reclassifications (15.0) 12.2 (4.8) (8.5)  
Amounts reclassified from accumulated other comprehensive loss 0.5 1.2 0.8 2.3  
Income tax benefit (expense) (0.2) (0.5) (0.3) (0.9)  
Other comprehensive income (loss) (14.7) 12.9 (4.3) (7.1) (25.3)
Balance at the end of the period $ (91.4) $ (68.9) $ (91.4) $ (68.9) $ (87.1)