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Debt Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Debt Instrument [Line Items]
Cash payments paid for interest			$ 42.9	$ 40.3
Amortization of net (loss) gain on treasury lock	$ 1.4	$ 1.4	2.8	2.8
Amortization of financing costs	0.4	$ 0.5	0.9	$ 0.9
Book value of fixed rate debt	1,647.0		1,647.0
Book value of variable rate debt	705.3		705.3
Long-term debt (fixed-rate debt), fair value	$ 1,693.9		1,693.9
Unsecured Debt | Seven-Year Term Loan, due October 2020
Debt Instrument [Line Items]
Repayment of debt			$ 3.3

X

- Definition

Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

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