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Unrecognized Tax Benefts (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Unrecognized tax benefits, beginning balance $ 41.6 $ 47.7 $ 28.2 $ 41.6
Increase in prior year tax positions   5.6 1.5 0.4
Decrease in prior year tax positions   (16.9) (0.4) (2.5)
Increase in current year tax positions   6.0 10.5 9.3
Increase from acquisitions     8.3  
Settlement (22.9) (3.7) (1.2) (17.3)
Unrecognized tax benefits, decrease resulting from foreign currency translation       (3.3)
Unrecognized tax benefits, increase resulting from foreign currency translation     0.8  
Unrecognized tax benefits, ending balance   38.7 47.7 28.2
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]        
Unrecognized tax benefits, interest and penalties, beginning balance $ 6.9 7.5 2.5 6.9
Interest and penalties, increase in prior year tax positions   3.5 3.1 2.0
Interest and penalties, decrease in prior year tax positions   (2.5) 0.0 (0.5)
Interest and penalties, increase in current year tax positions   0.0 0.0 0.0
Increase from acquisitions     1.9  
Interest and penalties, settlement   (1.6) (0.1) (5.6)
Unrecognized income tax benefit interest and penalties, decrease from foreign currency remeasurement adjustment       (0.3)
Unrecognized income tax benefit interest and penalties, increase from foreign currency remeasurement adjustment     0.1  
Unrecognized tax benefits, interest and penalties, ending balance   6.9 $ 7.5 2.5
Total Payments to Taxing Authority Regarding Transfer Pricing Issues, Including Payments Which Decreased Unrecognized Tax Benefits       $ 28.0
Foreign Tax Authority [Member]        
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Settlement   $ (20.0)