Long-Term Debt (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2016	Apr. 01, 2016	Mar. 31, 2016	Mar. 01, 2016	Feb. 29, 2016	Dec. 31, 2015
Long-Term Debt
Less deferred debt issuance costs		$ (12.3)					$ (13.3)
Total debt		3,010.7					2,813.5
Less current portion		375.2					0.3
Total long-term debt		2,635.5					2,813.2
Maturity of the Company's long-term debt over each of the next five years
2017		375.7
2018		0.3
2019		749.8
2020		0.1
2021		1,396.8
Thereafter		500.3
Debt (exclusive of unamortized deferred debt issuance costs)		3,023.0
Quoted Prices in Active Markets for Identical Assets (Level 1)
Long-Term Debt
Total debt, Approximate Fair Value		3,062.2					2,828.5
Less short-term debt, Approximate Fair Value		375.7					0.3
Long-term debt, Approximate Fair Value		2,686.5					2,828.2
The “Revolving Credit Facility”
Long-Term Debt
Maximum borrowing capacity					$ 2,000.0	$ 1,500.0
Increases in aggregate commitments					$ 500.0
Borrowings under the Revolving Credit Facility		0.0
Commercial Paper Program
Long-Term Debt
Maximum borrowing capacity			$ 2,000.0	$ 1,500.0
Unamortized discount		0.4					0.2
Debt carrying amount, net of unamortized discount before deferred debt issuance costs		$ 1,018.9					$ 823.9
Increases in aggregate commitments			$ 500.0
Maximum maturity term	397 days
Average interest rate (as a percent)		1.06%					0.88%
Commercial Paper Program | Quoted Prices in Active Markets for Identical Assets (Level 1)
Long-Term Debt
Total debt, Approximate Fair Value		$ 1,018.9					$ 823.9
Senior Notes
Long-Term Debt
Redemption price as a percentage of principal amount		100.00%
4.00% Senior Notes
Long-Term Debt
Stated interest rate (as a percent)		4.00%
Unamortized discount		$ 0.6					0.8
Debt carrying amount, net of unamortized discount before deferred debt issuance costs		499.4					499.2
4.00% Senior Notes | Quoted Prices in Active Markets for Identical Assets (Level 1)
Long-Term Debt
Total debt, Approximate Fair Value		$ 523.7					508.6
2.55% Senior Notes
Long-Term Debt
Stated interest rate (as a percent)		2.55%
Unamortized discount		$ 0.5					0.7
Debt carrying amount, net of unamortized discount before deferred debt issuance costs		749.5					749.2
2.55% Senior Notes | Quoted Prices in Active Markets for Identical Assets (Level 1)
Long-Term Debt
Total debt, Approximate Fair Value		$ 758.3					750.1
1.55% Senior Notes due September 2017
Long-Term Debt
Stated interest rate (as a percent)		1.55%
Unamortized discount		$ 0.1					0.2
Debt carrying amount, net of unamortized discount before deferred debt issuance costs		374.9					374.8
1.55% Senior Notes due September 2017 | Quoted Prices in Active Markets for Identical Assets (Level 1)
Long-Term Debt
Total debt, Approximate Fair Value		$ 375.4					373.2
3.125% Senior Notes due September 2021
Long-Term Debt
Stated interest rate (as a percent)		3.125%
Unamortized discount		$ 0.2					0.3
Debt carrying amount, net of unamortized discount before deferred debt issuance costs		374.8					374.7
3.125% Senior Notes due September 2021 | Quoted Prices in Active Markets for Identical Assets (Level 1)
Long-Term Debt
Total debt, Approximate Fair Value		380.4					367.7
Notes payable to foreign banks and other debt
Long-Term Debt
Debt carrying amount, net of unamortized discount before deferred debt issuance costs		5.5					5.0
Notes payable to foreign banks and other debt | Quoted Prices in Active Markets for Identical Assets (Level 1)
Long-Term Debt
Total debt, Approximate Fair Value		5.5					$ 5.0
Uncommitted standby letter of credit facility
Long-Term Debt
Maximum borrowing capacity		20.0
Credit facility issued as of year end		$ 12.7