Long-Term Debt -Fair Value of Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013	Jul. 31, 2013	Apr. 29, 2013
Term Loan [Member]
Fair Value [Line Items]
Long-term Debt, weighted average interest rate	3.25%	[1]
Debt, short-term and long-term	$ 1,525.1		$ 1,528.9
Discount, Unamortized	4.2		4.4	1.4	3.4
2019 Senior Notes, due 2019 [Member]
Fair Value [Line Items]
Long-term Debt, weighted average interest rate	8.50%	[1]
Debt, short-term and long-term	1,280.0		1,305.0
Premium, unamortized	4.0		4.2
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value [Line Items]
Debt, short-term and long-term	3,172.6
Fair Value, Inputs, Level 2 [Member]
Fair Value [Line Items]
Long-term Debt, fair value disclosures	$ 3,308.1

[1] Interest rate at March 31, 2014