Intangibles and Other Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Intangibles and Other Assets
Investments in affiliates	$ 33.9		$ 33.9		$ 33.2
Intangible assets (net of accumulated amortization)	129.5		129.5		137.1
Accumulated amortization	124.4		124.4		115.2
Capitalized software (net of accumulated amortization)	72.6		72.6		62.6
Accumulated amortization	110.1		110.1		103.8
Company and trust-owned life insurance	151.8		151.8		168.1
Long-term derivative assets	85.6		85.6		3.1
Deferred financing costs	62.4		62.4		36.3
Long-term deferred tax assets	50.2		50.2		66.5
Other	69.2		69.2		65.4
Intangibles and Other Assets	655.2		655.2		$ 572.3
Amortization expense of intangible assets	$ 9.2	$ 10.5	$ 18.6	$ 20.2