Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended		1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014	Nov. 30, 2014	Jan. 31, 2014
Debt
Debt	$ 2,673.9	$ 2,132.8
Less current portion	1.6	701.4
Total long-term debt	2,672.3	1,431.4
Total debt, Approximate Fair Value	2,704.0	2,146.0
Less short-term debt, Approximate Fair Value	(1.6)	(722.6)
Long-term debt, Approximate Fair Value	2,702.4	1,423.4
Issuance costs	11.1
Maturity of the Company's long-term debt over each of the next five years
2015	1.6
2016	0.6
2017	374.9
2018	672.7
2019	749.1
Thereafter	875.0
Total debt, Carrying Amount	2,673.9	2,132.8
Revolving Credit Facility
Debt
Debt		927.3
Total debt, Approximate Fair Value		927.3
Maximum amount outstanding during period	1,500.0
Average Interest Rate (as a percent)	0.00%	1.50%
Interest rate on borrowings under the Revolving Credit Facility, variable rate	LIBOR
Maturity of the Company's long-term debt over each of the next five years
Total debt, Carrying Amount		927.3
Credit Agreement
Debt
Debt		100.0
Total debt, Approximate Fair Value		100.0
Average Interest Rate (as a percent)	0.00%	1.16%
Maximum borrowing capacity	200.0
Borrowings under the Revolving Credit Facility	200.0
Maturity of the Company's long-term debt over each of the next five years
Total debt, Carrying Amount		100.0
Commercial Paper Program
Debt
Debt	671.0
Total debt, Approximate Fair Value	671.0
Unamortized discount	0.4
Maximum amount outstanding during period			1,500.0
Average Interest Rate (as a percent)	0.38%
Maximum maturity term			397 days
Maximum borrowing capacity	1,500.0
Maturity of the Company's long-term debt over each of the next five years
Total debt, Carrying Amount	671.0
Senior Notes [Member]
Debt
Redemption price as a percentage of principal amount	100.00%
4.75% Senior Notes due November 2014
Debt
Debt		599.8
Total debt, Approximate Fair Value		621.0
Stated interest rate (as a percent)	4.75%
Unamortized discount		0.2
Repayments of Debt				600.0
Maturity of the Company's long-term debt over each of the next five years
Total debt, Carrying Amount		599.8
4.00% Senior Notes due February 2022
Debt
Debt	499.1	499.0
Total debt, Approximate Fair Value	524.5	491.0
Stated interest rate (as a percent)	4.00%
Unamortized discount	0.9	1.0
Maturity of the Company's long-term debt over each of the next five years
Total debt, Carrying Amount	499.1	499.0
2.55% Senior Notes due January 2019
Debt
Debt	749.1
Total debt, Approximate Fair Value	754.9
Stated interest rate (as a percent)	2.55%
Unamortized discount	0.9
Debt instrument, principal amount					750.0
Debt instrument, face amount, net of discount (as a percent)	99.846%
Maturity of the Company's long-term debt over each of the next five years
Total debt, Carrying Amount	749.1
1.55% Senior Notes due September 2017
Debt
Debt	374.7
Total debt, Approximate Fair Value	373.0
Stated interest rate (as a percent)	1.55%
Unamortized discount	0.3
Debt instrument, principal amount			375.0
Debt instrument, face amount, net of discount (as a percent)	99.898%
Maturity of the Company's long-term debt over each of the next five years
Total debt, Carrying Amount	374.7
3.125% Senior Notes due September 2021
Debt
Debt	374.7
Total debt, Approximate Fair Value	375.3
Stated interest rate (as a percent)	3.125%
Unamortized discount	0.3
Debt instrument, principal amount			375.0
Debt instrument, face amount, net of discount (as a percent)	99.912%
Maturity of the Company's long-term debt over each of the next five years
Total debt, Carrying Amount	374.7
Notes payable to foreign banks and other debt
Debt
Debt	5.3	6.7
Total debt, Approximate Fair Value	5.3	6.7
Maturity of the Company's long-term debt over each of the next five years
Total debt, Carrying Amount	5.3	6.7
Standby Letters of Credit [Member]
Debt
Increase in commitment under the Revolving Credit Facility	11.6
Maximum borrowing capacity	$ 20.0