Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative financial instruments:
Tax benefit	$ (8.4)	$ (8.1)	$ (14.3)	$ (14.8)
Total reclassifications from accumulated other comprehensive income (loss)	0.0	(0.5)	(0.1)	(0.7)
Other non-operating expenses	0.2	0.3	0.5	0.6
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Derivative financial instruments:
Tax benefit	0.0	0.0	0.0	0.0
Total reclassifications from accumulated other comprehensive income (loss)	0.2	0.1	0.3	0.3
Other non-operating expenses	0.2	0.1	0.3	0.3
Derivative Financial Instruments [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Derivative financial instruments:
Tax benefit	0.0	0.0	0.0	0.0
Total reclassifications from accumulated other comprehensive income (loss)	(0.2)	0.4	(0.2)	0.4
Cost of Goods and Services Sold and Foreign Currency Transaction Gain (Loss), before Tax	$ (0.2)	$ 0.4	$ (0.2)	$ 0.4