Goodwill and Other Intangible Assets (Schedule of Expected Future Amortization Expense) (Details) $ in Millions	Dec. 31, 2016 USD ($)
Amortization Expense
Intangible assets, expected future amortization expense, 2017	$ 16.3
Intangible assets, expected future amortization expense, 2018	12.7
Intangible assets, expected future amortization expense, 2019	8.5
Intangible assets, expected future amortization expense, 2020	7.3
Intangible assets, expected future amortization expense, 2021	5.7
Intangible assets, expected future amortization expense, thereafter	20.1
Intangible assets, expected future amortization expense, total	$ 70.6