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Intangibles and Other Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Intangibles and Other Assets          
Investments in affiliates $ 33.7   $ 33.7   $ 33.2
Intangible assets (net of accumulated amortization) 123.9   123.9   137.1
Accumulated amortization 129.9   129.9   115.2
Capitalized software (net of accumulated amortization) 75.8   75.8   62.6
Accumulated amortization 112.4   112.4   103.8
Company and trust-owned life insurance 142.1   142.1   168.1
Long-term derivative assets 2.5   2.5   3.1
Deferred financing costs 61.6   61.6   36.3
Long-term deferred tax assets 87.1   87.1   66.5
Other 66.3   66.3   65.4
Intangibles and Other Assets 593.0   593.0   $ 572.3
Amortization expense of intangible assets $ 9.6 $ 10.4 $ 28.2 $ 30.6