Debt (Details) - USD ($) $ in Millions			12 Months Ended
	Apr. 06, 2016	Mar. 28, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jan. 19, 2016	Oct. 31, 2015	Mar. 26, 2015
Credit Facilities [Abstract]
Available and unused credit lines			$ 3,632.0	$ 3,657.7
Short-Term Borrowings [Abstract]
Short-term debt			$ 28.7	$ 5.2
Short-term borrowings, weighted average interest rate			9.80%	3.70%
Long-Term Debt [Abstract]
Long-term debt, carrying amount			$ 4,900.1	$ 4,500.3
Unamortized premium (discount), net			7.6	10.1
Unamortized debt issuance costs			(24.2)	(16.9)
Unamortized deferred gain from settlement of interest rate swaps			84.7	49.9
Fair value adjustment attributed to interest rate swaps			(47.6)	22.2
Long-term debt, total			4,920.6	4,565.6
Long-term debt, current portion			(0.1)	(1,001.4)
Long-Term Debt			4,920.5	3,564.2
Cash flow hedge, unrealized loss, net of tax			26.2	3.3	$ 0.0
Cash flow hedge, unrealized loss, tax			(18.7)	(2.3)	0.0
Proceeds from borrowings			1,389.6	0.0	747.6
Deferred Loss From Settlement Of Interest Rate Swaps			54.5	0.0	0.0
Convertible Debt [Abstract]
Convertible Debt			0.0	0.0
Convertible debt, principle amount settled in cash			0.0	0.0	252.7
Components of Interest Expense [Abstract]
Interest expense, Long-term debt			205.5	210.2	192.7
Interest rate swaps			(13.1)	(44.1)	(30.5)
Interest expense, Amortization of deferred gain on interest rate swaps			(15.4)	(9.2)	(7.2)
Interest expense, Commercial paper			6.8	4.8	2.9
Interest expense, Fees			5.6	5.7	6.2
Interest expense, Other			20.3	13.7	13.1
Interest expense, total			209.7	$ 181.1	177.2
Contractual Maturities of Long-Term Debt [Abstract]
Contractual maturities of long-term debt, 2017			0.1
Contractual maturities of long-term debt, 2018			0.0
Contractual maturities of long-term debt, 2019			500.0
Contractual maturities of long-term debt, 2020			1,000.0
Contractual maturities of long-term debt, 2021			0.0
Contractual maturities of long-term debt, Thereafter			3,400.0
Contractual maturities of long-term debt			4,900.1
Forward-Starting Interest Rate Swap [Member]
Long-Term Debt [Abstract]
Interest rate swaps, inception date				Mar. 26, 2015
Interest rate swaps, notional amount								$ 1,000.0
Deferred Loss From Settlement Of Interest Rate Swaps		$ 54.5
Interest rate swaps, liability, at fair value				$ 5.6
Interest Rate Swap [Member]
Long-Term Debt [Abstract]
Interest rate swaps, notional amount			1,250.0	1,750.0
Interest Rate Swaps on 2020 Notes [Member]
Long-Term Debt [Abstract]
Unamortized deferred gain from settlement of interest rate swaps							$ (36.9)
Interest rate swaps, notional amount					1,000.0
Interest Rate Swaps on 2022 Notes [Member]
Long-Term Debt [Abstract]
Unamortized deferred gain from settlement of interest rate swaps						$ (54.2)	(13.5)
Interest rate swaps, notional amount					$ 1,250.0		1,000.0
Interest rate swaps, asset, at fair value				32.2
Interest Rate Swaps on 2024 Notes [Member]
Long-Term Debt [Abstract]
Interest rate swaps, notional amount							$ 750.0
Interest rate swaps, liability, at fair value			17.1	$ 10.0
Interest Rate Swaps on 2024 Notes [Member] | LIBOR [Member]
Long-Term Debt [Abstract]
Interest rate swaps, spread				1.72%
Interest Rate Swaps on 2026 Notes [Member]
Long-Term Debt [Abstract]
Interest rate swaps, notional amount	$ 500.0
Interest rate swaps, liability, at fair value			30.5
Interest Rate Swaps on 2026 Notes [Member] | LIBOR [Member]
Long-Term Debt [Abstract]
Interest rate swaps, spread	1.982%
Credit Facility [Member]
Credit Facilities [Abstract]
Credit Facility, maximum borrowing capacity			$ 2,500.0
Credit Facility, expiration date			Jul. 31, 2021
Available and unused credit lines			$ 2,500.0	$ 2,500.0
Credit Facility, covenant terms			The Credit Facility contains financial covenants that require us to maintain a Leverage Ratio of consolidated indebtedness to consolidated EBITDA of no more than 3 times for the most recently ended 12-month period (EBITDA is defined as earnings before interest, taxes, depreciation and amortization) and an Interest Coverage Ratio of consolidated EBITDA to interest expense of at least 5 times for the most recently ended 12-month period.
Credit Facility, covenant compliance			At December 31, 2016, we were in compliance with these covenants as our Leverage Ratio was 2.2 times and our Interest Coverage Ratio was 11.0 times.
Commercial Paper [Member]
Credit Facilities [Abstract]
Credit Facility, maximum borrowing capacity			$ 2,000.0
Uncommitted credit lines [Member]
Credit Facilities [Abstract]
Available and unused credit lines			1,132.0	1,157.7
5.9% Senior Notes due 2016
Long-Term Debt [Abstract]
Long-term debt, carrying amount			$ 0.0	1,000.0
Long-term debt, interest rate			5.90%
Long-term debt, maturity date			Apr. 15, 2016
6.25% Senior Notes due 2019
Long-Term Debt [Abstract]
Long-term debt, carrying amount			$ 500.0	500.0
Long-term debt, interest rate			6.25%
Long-term debt, maturity date			Jul. 15, 2019
4.45% Senior Notes due 2020
Long-Term Debt [Abstract]
Long-term debt, carrying amount			$ 1,000.0	1,000.0
Long-term debt, interest rate			4.45%
Long-term debt, maturity date			Aug. 15, 2020
3.625% Senior Notes due 2022
Long-Term Debt [Abstract]
Long-term debt, carrying amount			$ 1,250.0	1,250.0
Long-term debt, interest rate			3.625%
Long-term debt, maturity date			May 01, 2022
3.65% Senior Notes due 2024
Long-Term Debt [Abstract]
Long-term debt, carrying amount			$ 750.0	750.0
Long-term debt, interest rate			3.65%
Long-term debt, maturity date			Nov. 01, 2024
3.60% Senior Notes due 2026
Long-Term Debt [Abstract]
Long-term debt, carrying amount	$ 1,400.0		$ 1,400.0	0.0
Long-term debt, interest rate	3.60%		3.60%
Long-term debt, maturity date	Apr. 15, 2026		Apr. 15, 2026
Long-term debt, effective interest rate	4.10%
Proceeds from borrowings	$ 1,387.0
Other debt
Long-Term Debt [Abstract]
Long-term debt, carrying amount			$ 0.1	$ 0.3
Convertible Notes due July 31, 2032
Convertible Debt [Abstract]
Convertible debt, repurchase date				Jul. 31, 2014
Convertible debt, shares issued for conversion premium					1,217,112