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Debt (Details) - USD ($) $ in Millions	Dec. 31, 2016	Jun. 01, 2016	May 24, 2016	Dec. 31, 2015	Mar. 18, 2014	Nov. 18, 2010
Debt Instrument [Line Items]
Loans Payable to Bank, Current	$ 1.0			$ 2.1
Loans Payable to Bank, Noncurrent	0.0			1.1
Capital Lease Obligations, Current	0.8			0.6
Capital Lease Obligations, Noncurrent	9.0			8.5
Other Long-term Debt, Current	0.0			6.1
Other Long-term Debt, Noncurrent	0.0			7.0
Long-term Debt and Capital Lease Obligations, Current	26.7			34.9
Long-term Debt and Capital Lease Obligations	1,060.0			1,085.3
Secured Debt Term A [Member]
Debt Instrument [Line Items]
Secured Debt, Current	24.9			26.1
Secured Long-term Debt, Noncurrent	460.3			479.7
Senior Unsecured Notes Due 2022 [Member]
Debt Instrument [Line Items]
Secured Debt, Current	0.0			0.0
Debt Instrument, Face Amount					$ 300.0
Senior notes (due 2017 and 2020)	293.8
Secured Long-term Debt, Noncurrent	293.8			292.7
Debt Instrument, Interest Rate, Stated Percentage					5.25%
Senior Unsecured Notes Due Two Thousand And Twenty [Member]
Debt Instrument [Line Items]
Secured Debt, Current	0.0			0.0
Debt Instrument, Face Amount			$ 300.0			$ 300.0
Secured Long-term Debt, Noncurrent	0.0			296.3
Debt Instrument, Interest Rate, Stated Percentage						6.75%
Senior Unsecured Notes Due 2026 [Member]
Debt Instrument [Line Items]
Secured Debt, Current	0.0			0.0
Debt Instrument, Face Amount		$ 300.0
Senior notes (due 2017 and 2020)	296.9
Secured Long-term Debt, Noncurrent	$ 296.9			$ 0.0
Debt Instrument, Interest Rate, Stated Percentage		3.85%