v3.5.0.2
Changes in accumulated other comprehensive loss by component (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
AOCI Attributable to Parent, Net of Tax        
Beginning Balance     $ 213.9  
Ending Balance $ 82.5   82.5  
Cash flow hedges        
AOCI Attributable to Parent, Net of Tax        
Beginning Balance (0.1) $ 0.1 0.2 $ 0.1
Ending Balance 0.1 (0.1) 0.1 (0.1)
Other comprehensive income (loss)        
Net change from periodic revaluations 0.1 (0.7) (1.0) (1.3)
Tax (expense) benefit (0.1) 0.3 0.4 0.5
Total Other comprehensive (loss) income before reclassifications, net of tax   (0.4) (0.6) (0.8)
Amount reclassified        
Total Other comprehensive income 0.2 (0.2) (0.1) (0.2)
Foreign currency translation        
AOCI Attributable to Parent, Net of Tax        
Beginning Balance (119.7) (96.9) (139.1) (66.3)
Ending Balance (141.7) (119.0) (141.7) (119.0)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax 0.0 0.0 0.0 0.0
Other comprehensive income (loss)        
Foreign currency translation adjustments (22.0) (22.1) (2.6) (52.7)
Amount reclassified from accumulated other comprehensive income | Cash flow hedges        
Amount reclassified        
Tax expense. (0.1) (0.1) (0.4) (0.4)
Total amount reclassified from Accumulated other comprehensive loss, net of tax 0.2 0.2 0.5 0.6
Amount reclassified from accumulated other comprehensive income | Foreign currency translation        
AOCI Attributable to Parent, Net of Tax        
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0.0 0.0 0.0 0.0
Interest rate swaps | Amount reclassified from accumulated other comprehensive income | Cash flow hedges        
Amount reclassified        
Amount reclassified from AOCI $ 0.3 $ 0.3 $ 0.9 $ 1.0