Debt and Credit Facilities - Narrative (Details) € in Millions, $ in Millions		1 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 25, 2017 USD ($)	Jul. 31, 2017 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	[1]	Jun. 30, 2015 EUR (€)	Jun. 30, 2015 USD ($)
Debt Instrument [Line Items]
Loss on debt redemption and refinancing activities					$ 0.0	$ 0.1	$ 110.0
Term Loan A Due July 2019
Debt Instrument [Line Items]
Prepayments of Term Loan A facility due in July 2019	$ 755.2	$ 96.3		$ 96.3
Credit facility, remaining balance				222.7	222.7	818.3
5.50% Senior Notes due September 2025
Debt Instrument [Line Items]
Senior notes				$ 396.7	$ 396.7	396.4				$ 400.0
Debt interest rate				5.50%	5.50%				5.50%	5.50%
Non-lender fees			$ 8.0
4.50% Senior Notes due September 2023
Debt Instrument [Line Items]
Senior notes				$ 474.3	$ 474.3	$ 416.7			€ 400
Debt interest rate				4.50%	4.50%				4.50%	4.50%
8.375% Senior Notes Due September 2021
Debt Instrument [Line Items]
Debt interest rate									8.375%	8.375%
Repurchased debt principal amount			750.0
Aggregate repurchase price of senior notes			866.0
Premium paid on redemption of debt			99.0
Accrued interest paid on redemption of debt			17.0
Loss on debt redemption and refinancing activities			110.0
Amortization of non-lender fees			$ 11.0
Term Loan A Due July 2017
Debt Instrument [Line Items]
Repayment of Term Loan A facility due July 2017		$ 250.0

[1] During the first quarter of 2015, the Company received the tax refund of $235.2 million related to the Settlement agreement payment. See Note 16 “Income Taxes” of the Notes to Consolidated Financial Statements for further discussion of the out-of-period adjustment.