v3.4.0.3
Changes in accumulated other comprehensive loss by component (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Changes in accumulated other comprehensive loss by component      
Balance at beginning of period $ (139.3)    
Other comprehensive income (loss):      
Foreign currency translation adjustments 18.5 $ (35.1)  
Tax benefit 1.6 (4.6)  
Total Other comprehensive income (loss) 18.2 (35.4)  
Balance at end of period (121.2)   $ (139.3)
Foreign currency translation      
Changes in accumulated other comprehensive loss by component      
Balance at beginning of period (139.1) (66.3) (66.3)
Other comprehensive income (loss):      
Foreign currency translation adjustments 18.4 (35.1)  
Balance at end of period (120.7) (101.4) (139.1)
Pension      
Changes in accumulated other comprehensive loss by component      
Balance at beginning of period (0.4) (2.1) (2.1)
Other comprehensive income (loss):      
Balance at end of period (0.4) (2.1) (0.4)
Cash flow hedges      
Changes in accumulated other comprehensive loss by component      
Balance at beginning of period 0.2 0.1 0.1
Other comprehensive income (loss):      
Tax benefit (expense) 0.3 0.4  
Total Other comprehensive income (loss) before reclassifications, net of tax (0.5) (0.5)  
Total amount reclassified from Accumulated other comprehensive loss, net of tax 0.2 0.2  
Net change from periodic revaluations (0.8) (0.9)  
Tax benefit (0.1) (0.1)  
Total Other comprehensive income (loss) (0.3) (0.3)  
Balance at end of period (0.1) (0.2) $ 0.2
Cash flow hedges | Interest rate swaps      
Other comprehensive income (loss):      
Net amount reclassified to earnings (loss): 0.3 0.3  
Cash flow hedges | Amount reclassified from accumulated other comprehensive income      
Other comprehensive income (loss):      
Net amount reclassified to earnings (loss): $ 0.3 $ 0.3