Shareholders' Equity - Accumulated Other Comprehensive Income (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($)
Summary of the components of accumulated other comprehensive income (loss), net of tax
Balance at beginning of period	$ (75.9)
Balance at end of period	(60.2)
Accumulated Other Comprehensive Income (Loss)
Summary of the components of accumulated other comprehensive income (loss), net of tax
Balance at beginning of period	(75.9)
Other comprehensive income (loss) before reclassifications	14.6
Realized gain on reclassification, net of tax of $0.0 million	1.1
Net current period other comprehensive income	15.7
Balance at end of period	(60.2)
Realized gain on reclassification, tax	0.0
Foreign Currency Translation
Summary of the components of accumulated other comprehensive income (loss), net of tax
Balance at beginning of period	(24.1)
Other comprehensive income (loss) before reclassifications	15.5
Net current period other comprehensive income	15.5
Balance at end of period	(8.6)
Pension Liability Adjustment
Summary of the components of accumulated other comprehensive income (loss), net of tax
Balance at beginning of period	(51.8)
Other comprehensive income (loss) before reclassifications	(0.9)
Realized gain on reclassification, net of tax of $0.0 million	1.1
Net current period other comprehensive income	0.2
Balance at end of period	(51.6)
Realized gain on reclassification, tax	$ 0.0