Derivative Instruments (Details) € in Millions, £ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 GBP (£)	Sep. 30, 2015 USD ($)	Sep. 30, 2015 MXN / $	Sep. 30, 2015 BRL / $	Aug. 05, 2015 USD ($)	Aug. 05, 2015 EUR (€)	Jul. 31, 2015 GBP (£)	Jul. 31, 2015 USD ($)	Jul. 13, 2015 £ / $
Derivative Instruments, Gain (Loss) [Line Items]
Derivative financial instruments revaluation, net of tax	$ (47,300,000)	$ (2,600,000)	$ (49,900,000)	$ (2,200,000)
Foreign currency exchange rate							0.0591	0.2527
Foreign Exchange Forward [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Debt amount affected by interest rate swap											£ 1,060	$ 1,640,000,000
Foreign currency exchange rate | £ / $													1.5487
Percentage of forward at fixed exchange rate											50.00%	50.00%
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency forward contract						$ 910,000,000
Foreign Exchange Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative financial instruments revaluation, net of tax	(47,300,000)	(2,600,000)	(49,900,000)	(2,200,000)
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) recorded to other comprehensive income related to foreign currency hedges	$ 18,100,000.0	$ 0	$ 18,100,000.0	$ 200,000
United States of America, Dollars [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency forward contract | £					£ 533
United Kingdom, Pounds [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency forward contract						$ 99,800,000
Maximum [Member] | Foreign Exchange Forward [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Exchange rate on 50% of forward contract | £ / $													1.6244
USD Notes [Member] | Notes Payable to Banks [Member] | Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Debt amount affected by interest rate swap									$ 1,160,000,000
Interest rate swap rate									1.96%	1.96%
Euro Notes [Member] | Notes Payable to Banks [Member] | Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Debt amount affected by interest rate swap | €										€ 285
Interest rate swap rate									1.20%	1.20%