Stockholders' Equity (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	$ 5,079.4
Other comprehensive income (loss), net of tax	67.0	$ (28.7)
Ending balance	13,559.2
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	(307.5)
Other comprehensive income (loss) before reclassifications, net of tax	6.6
Other comprehensive income (loss), net of tax	6.6
Ending balance	(300.9)
Available-For-Sale Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Other comprehensive income (loss) before reclassifications, net of tax	0.8
Other comprehensive income (loss), net of tax	0.8
Ending balance	0.8
Hedging
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	(126.9)
Other comprehensive income (loss) before reclassifications, net of tax	24.7
Reclassification adjustment for net losses (gains) included in net income, net of tax	34.4
Other comprehensive income (loss), net of tax	59.1
Ending balance	(67.8)
Defined Pension and Other Post-retirement Benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	(40.8)
Reclassification adjustment for net losses (gains) included in net income, net of tax	0.5
Other comprehensive income (loss), net of tax	0.5
Ending balance	(40.3)
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	(475.2)
Other comprehensive income (loss) before reclassifications, net of tax	32.1
Reclassification adjustment for net losses (gains) included in net income, net of tax	34.9
Other comprehensive income (loss), net of tax	67.0
Ending balance	$ (408.2)