Stockholders' Equity (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance			$ 5,111.9
Other comprehensive income (loss), net of tax	$ (5.0)	$ 98.4	62.0	$ 69.7
Ending balance	13,549.3		13,549.3
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance			(849.8)
Other comprehensive income (loss) before reclassifications, net of tax			(34.9)
Other comprehensive income (loss), net of tax			(34.9)
Ending balance	(884.7)		(884.7)
Hedging Instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance			(126.9)
Other comprehensive income (loss) before reclassifications, net of tax			42.3
Reclassification adjustment for net losses (gains) included in net income, net of tax			54.7
Other comprehensive income (loss), net of tax			97.0
Ending balance	(29.9)		(29.9)
Defined Pension and Other Post-retirement Benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance			(80.7)
Other comprehensive income (loss) before reclassifications, net of tax			(1.2)
Reclassification adjustment for net losses (gains) included in net income, net of tax			1.1
Other comprehensive income (loss), net of tax			(0.1)
Ending balance	(80.8)		(80.8)
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance			(1,057.4)
Other comprehensive income (loss) before reclassifications, net of tax			6.2
Reclassification adjustment for net losses (gains) included in net income, net of tax			55.8
Other comprehensive income (loss), net of tax			62.0
Ending balance	$ (995.4)		$ (995.4)