Contractual interest rate for funds borrowed, under the debt agreement.

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Debt - Summary of Debt (Details) - USD ($) $ in Millions	12 Months Ended
Debt - Summary of Debt (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Sep. 05, 2014	Oct. 22, 2013	Jun. 26, 2012	Mar. 25, 2008
Debt Instrument [Line Items]
Long-term debt	$ 2,658.2	$ 2,309.2
Less current portion	25.8	6.5
Less unamortized debt issuance costs	12.4	12.3
Total long-term debt	$ 2,620.0	$ 2,290.4
Weighted-average interest rate	3.54%	3.67%
Revolving Credit Facility, due October 2018 \| Line of Credit
Debt Instrument [Line Items]
Credit facility, expiration date	Oct. 18, 2018
Revolving Credit Facility, due August 2021 \| Line of Credit
Debt Instrument [Line Items]
Long-term debt	$ 0.0	$ 0.0
Stated interest rate	0.00%	0.00%
Credit facility, expiration date	Aug. 21, 2021
Five-Year Term Loan, due October 2018 \| Unsecured Debt
Debt Instrument [Line Items]
Long-term debt	$ 0.0	$ 25.0
Stated interest rate	0.00%	1.80%
Credit facility, expiration date	Oct. 18, 2018
Five-Year Term Loan, due August 2021 \| Unsecured Debt
Debt Instrument [Line Items]
Long-term debt	$ 380.2	$ 0.0
Stated interest rate	2.02%	0.00%
Credit facility, expiration date	Aug. 21, 2021
Seven-Year Term Loan, due October 2020 \| Unsecured Debt
Debt Instrument [Line Items]
Long-term debt	$ 630.5	$ 637.0
Stated interest rate	2.40%	2.05%
Debt instrument, maturity date	Oct. 18, 2020
6.50% Senior Notes due March 2018 \| Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 150.0	$ 150.0
Stated interest rate	6.50%	6.50%				6.50%
Debt instrument, maturity date	Mar. 15, 2018
3.90% Senior Notes, due June 2022 \| Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 399.8	$ 399.7
Stated interest rate	3.90%	3.90%			3.90%
Debt instrument, maturity date	Jun. 15, 2022
Senior notes, discount	$ 0.2	$ 0.3
4.50% Senior Notes, due November 2023 \| Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 698.6	$ 698.5
Stated interest rate	4.50%	4.50%		4.50%
Debt instrument, maturity date	Nov. 01, 2023
Senior notes, discount	$ 1.4	$ 1.7
3.65% Senior Notes, due September 2024 \| Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 399.1	$ 399.0
Stated interest rate	3.65%	3.65%	3.65%
Debt instrument, maturity date	Sep. 15, 2024
Senior notes, discount	$ 0.9	$ 1.1
Current Portion of Long-term Debt
Debt Instrument [Line Items]
Weighted-average interest rate	2.11%	2.05%
Long-term Debt, Excluding Current Portion
Debt Instrument [Line Items]
Weighted-average interest rate	3.57%	3.69%