Goodwill and Other Intangible Assets, Acquired Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Increase in intangibles	$ 8.8
Amortization expense	7.8	$ 4.8	$ 0.0
Acquired Finite-Lived Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	7.9	$ 4.6	$ 0.6
Estimated amortization expense, 2015	8.1
Estimated amortization expense, 2017	7.9
Estimated amortization expense, 2018	7.9
Estimated amortization expense, 2019	7.9
Estimated amortization expense, 2020	7.9
Estimated amortization expense, thereafter	$ 172.9