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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accumulated Other Comprehensive Income        
Balance, December 31, 2017     $ 1,215.4  
Other comprehensive income (loss) $ (10.3) $ 5.1 (0.8) $ 15.8
Balance, June 30, 2018 1,286.6   1,286.6  
Unrealized Translation        
Accumulated Other Comprehensive Income        
Balance, December 31, 2017     (31.6)  
Other comprehensive income (loss)     (0.7)  
Balance, June 30, 2018 (32.3)   (32.3)  
Defined Benefit Pension Plans        
Accumulated Other Comprehensive Income        
Balance, December 31, 2017     0.8  
Other comprehensive income (loss)     0.7  
Balance, June 30, 2018 1.5   1.5  
Cash Flow Hedges        
Accumulated Other Comprehensive Income        
Balance, December 31, 2017     (0.5)  
Other comprehensive income (loss)     (0.8)  
Balance, June 30, 2018 (1.3)   (1.3)  
Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Income        
Balance, December 31, 2017     (31.3)  
Balance, June 30, 2018 $ (32.1)   $ (32.1)