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Other Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Business incentive plan assets [Line Items]      
Upfront Incentive Payments $ 56.0   $ 0.0
Available for sale securities 1.7   5.2
Deferred income taxes—non-current 184.8   198.4
Business Incentive Plan Assets 190.8   173.0
Other assets 111.8   52.0
Total 489.1 $ 426.7 428.6
Other Assets [Member]      
Business incentive plan assets [Line Items]      
Upfront Incentive Payments $ 49.8   $ 0.0