Derivative Financial Instruments and Hedging Activities - Schedule of Effect of Derivatives As Hedges, Net of Applicable Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			$ (503.9)	$ (590.0)
Ending balance	$ (1,409.1)	$ (430.9)	(1,409.1)	(430.9)
Unrealized Hedging (Losses) Gains
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(41.2)	(3.3)	(19.6)	(17.4)
Amount of Loss (Gain) Recognized in Other Comprehensive Loss on Derivatives (Effective Portion)	(7.6)	3.9	(38.6)	23.7
Amount of (Loss) Gain Reclassified from Accumulated Other Comprehensive Loss into Statement of Operations (Effective Portion)	3.0	(5.7)	12.4	(11.4)
Ending balance	(45.8)	(5.1)	(45.8)	(5.1)
Amount of loss (gain) recognized, tax expense (benefit)	1.4	0.3	7.1	(4.3)
Amount of loss (gain) reclassified, tax benefit (expense)	(0.4)	(0.4)	(1.8)	5.5
Cash Flow Hedging \| Unrealized Hedging (Losses) Gains \| Foreign Currency Hedge
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	1.5	1.4	2.2	0.9
Amount of Loss (Gain) Recognized in Other Comprehensive Loss on Derivatives (Effective Portion)	(2.5)	3.7	(7.3)	10.4
Amount of (Loss) Gain Reclassified from Accumulated Other Comprehensive Loss into Statement of Operations (Effective Portion)	1.0	(3.6)	5.1	(9.8)
Ending balance	0.0	1.5	0.0	1.5
Cash Flow Hedging \| Unrealized Hedging (Losses) Gains \| Interest Rate Hedge
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(42.3)	(4.4)	(22.5)	(16.4)
Amount of Loss (Gain) Recognized in Other Comprehensive Loss on Derivatives (Effective Portion)	(5.2)	(0.2)	(30.3)	11.3
Amount of (Loss) Gain Reclassified from Accumulated Other Comprehensive Loss into Statement of Operations (Effective Portion)	2.0	(2.1)	7.3	(1.6)
Ending balance	(45.5)	(6.7)	(45.5)	(6.7)
Net Investment Hedging \| Unrealized Hedging (Losses) Gains \| Foreign Currency Hedge
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(0.4)	(0.3)	0.7	(1.9)
Amount of Loss (Gain) Recognized in Other Comprehensive Loss on Derivatives (Effective Portion)	0.1	0.4	(1.0)	2.0
Amount of (Loss) Gain Reclassified from Accumulated Other Comprehensive Loss into Statement of Operations (Effective Portion)	0.0	0.0	0.0	0.0
Ending balance	$ (0.3)	$ 0.1	$ (0.3)	$ 0.1

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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