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Borrowings (Details) $ in Millions		3 Months Ended
	Feb. 09, 2016 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2015	Feb. 08, 2016 USD ($)	Dec. 31, 2015 USD ($)
Long-term borrowings [Abstract]
Long-term debt		$ 401.2			$ 428.8
Less: current maturities		29.5			29.6
Long-term debt (noncurrent)		$ 371.7			399.2
Senior Notes
Long-term borrowings [Abstract]
Debt term		5 years
Senior Notes | Term Loan due January 2019
Long-term borrowings [Abstract]
Long-term debt		$ 276.2			283.8
Line of Credit | Revolving Credit Facility
Long-term borrowings [Abstract]
Secured revolving credit facility, maximum borrowing capacity	$ 300.0	$ 300.0		$ 350.0
Debt term		5 years
Line of Credit | Revolving Credit Facility | Revolving Credit Facility due January 2019
Long-term borrowings [Abstract]
Long-term debt		$ 125.0			$ 145.0
Line of Credit | Revolving Credit Facility | Credit Facilities [Member]
Long-term borrowings [Abstract]
Debt covenant, debt to EBITDA	45,000,000
Credit Facilities [Member]
Long-term borrowings [Abstract]
Debt covenant, EBITDA to interest ratio		3.25
Debt covenant, debt to EBITDA		3.25
Credit Facilities [Member] | Minimum
Long-term borrowings [Abstract]
commitment fee percentage		0.20%
Credit Facilities [Member] | Maximum
Long-term borrowings [Abstract]
commitment fee percentage		0.40%
Credit Facilities [Member] | Weighted Average
Long-term borrowings [Abstract]
commitment fee percentage		0.40%	0.30%
Credit Facilities [Member] | LIBOR
Long-term borrowings [Abstract]
Interest rate at period end		2.68%	1.93%
Credit Facilities [Member] | LIBOR | Minimum
Long-term borrowings [Abstract]
Basis spread on variable rate		1.25%
Credit Facilities [Member] | LIBOR | Maximum
Long-term borrowings [Abstract]
Basis spread on variable rate		2.25%

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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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