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

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Long Term Debt and Financing Arrangements - Schedule of Long Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2018	Feb. 28, 2018	Feb. 02, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-Term Debt	$ 1,792.5			$ 987.1
Senior Notes \| Senior notes at 3.625%
Debt Instrument [Line Items]
Interest rate, stated percentage	3.625%
Long-Term Debt	$ 298.3			297.9
Senior Notes \| Senior notes at 3.35%
Debt Instrument [Line Items]
Interest rate, stated percentage	3.35%
Long-Term Debt	$ 394.9			394.4
Senior Notes \| Senior notes at 3.15%
Debt Instrument [Line Items]
Interest rate, stated percentage	3.15%
Long-Term Debt	$ 295.2			294.8
Senior Notes \| Senior notes at 3.50%
Debt Instrument [Line Items]
Interest rate, stated percentage	3.50%	3.50%	3.50%
Long-Term Debt	$ 443.1			0.0
Senior Notes \| Term loan, net of current portion of $25 million
Debt Instrument [Line Items]
Current portion of long-term debt	25.0
Long-Term Debt	$ 361.0			$ 0.0