Debt (Details) - USD ($) $ in Millions	1 Months Ended
	Jan. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Debt
Total borrowings		$ 1,271.8	$ 1,309.4
Less: unamortized discounts and issuance costs		(18.9)	(20.1)
Total borrowings, net		1,252.9	1,289.3
Less: current maturities of long-term debt		(12.8)	(47.2)
Long-term debt, net		1,240.1	1,242.1
Long-term debt (excluding interest payments)
Remainder of 2017		9.6
2018		12.8
2019		12.8
2020		12.8
2021		12.8
Thereafter		1,211.0
Total borrowings		1,271.8	1,309.4
Senior Secured Term Loan Facility
Debt
Debt instrument face amount		1,275.0
Revolving Credit Facility
Debt
Debt instrument face amount		200.0
Term Loan due in 2020
Debt
Total borrowings		1,271.8	1,275.0
Long-term debt (excluding interest payments)
Total borrowings		$ 1,271.8	1,275.0
Senior Notes
Debt
Total borrowings			34.4
Debt instrument face amount			$ 600.0
Interest rate (as a percent)			5.25%
Face value of debt redeemed	$ 36.1
Long-term debt (excluding interest payments)
Total borrowings			$ 34.4